The first mention of a way to change to Necromancer class from a Magician at level 200 or higher[2]. In order to do so, one must meet one of the few Necromancer or rely on a Necromancer's legacy [3]. Therefore, this is a rare class advancement [4]. It was unlocked[5] by Weed and indirectly promoted[6]through the media, and Weed's public video [7].

The Necromancer profession is unable to exert its full power due to Goddess Freya's curse[8]. It was stated when Weed went back in time to Slay the Gluttony Demon. Freya was ready to release some of those restriction to assist Weed. However it is not know if the effects still persist, and applies to every Necromancer on the central continent.

One has to be an necromancer to be safe around undeads. Therefore, it is a lonely class.

Controlling large number of undead, and especially high level undead are influence by other stat. For example, high Leadership stat and Honor are useful to easier control dark knights.

Often, corpses and specific skill are needed to summon high ranked undead. Also, quality of the corpse determines the type and strength of the undead, and even the possibility of it keeping part of his former skills & personality.

To maintain the undead, necromantic magic mana without end. The larger the number of undead, the higher the output. Same with stronger undead.

Undead are vulnerable to holy magic, etc

As a magic based on darkness, and often evil, this class is disliked by many other class, especially Paladin & most of the cleric class.

Unlike Low Tier and Middle Tier Undead summoning, high level corpse is needed, around level 300. But it is also possible to summon them through any normal corpse if the necromancer use the legendary Copper Plate of Eternal Rest

Chanting: “Rise again. I will save you from the tortures at the bottom of the hell. I will give you power, enough to rule the world. Summon Death Knight!”

Undead, as any other monster, can raise his experience bar. This is especially true for higher level undead, with a stronger conscience & personality. Good example are Weed's undead subordinate : Tori or Van Hawk

The necromancer Bar Khan, when he was still alive was considered the highest master alive in necromancer magic. Inside RR, his magic tome, Bar Khan's Necromancer Tome is a major legacy item, equivalent to one or more master's special skill.